CN109684232A - A kind of Embedded Protocol Stack EMS memory management process - Google Patents
A kind of Embedded Protocol Stack EMS memory management process Download PDFInfo
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- CN109684232A CN109684232A CN201811236436.5A CN201811236436A CN109684232A CN 109684232 A CN109684232 A CN 109684232A CN 201811236436 A CN201811236436 A CN 201811236436A CN 109684232 A CN109684232 A CN 109684232A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
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Abstract
The present invention relates to a kind of Embedded Protocol Stack EMS memory management process, belong to embedded device communication optimization technical field.The present invention only provides master data global memory when protocol stack initializes, to guarantee that system can be run；Protocol stack associated internal memory needed for business is provided by business module itself, each business module according to demand will be in the memory injection protocol stack of oneself actual use in initialization, scheduling is uniformly managed by protocol stack, the standardization of protocol stack interface can either be met, completely compatible original standard Socket interface, memory has been simplified to greatest extent again, and protocol stack committed memory itself is within 4K.The present invention can preferably resolve protocol stack memory scale on the basis of keeping protocol stack standard interface and business demand is difficult to adaptation issues, convenient for the extension of business module.
Description
Technical field
The present invention relates to a kind of Embedded Protocol Stack EMS memory management process, belong to embedded device communication optimization technology neck
Domain.
Background technique
Inexpensive embedded device often faces the predicament of limited memory, and requirement of the protocol stack to memory is to compare
High.A kind of typical embedded device Memory Allocation is (system physical internal memory 128K) as shown in table 1.
Table 1
| Serial number | Function | Memory requirements |
| 1 | Operating system | 20K |
| 2 | Business function | 60K |
| 3 | Data storage | 20K |
| 4 | Standard protocol stack | 20K or more |
As it can be seen that the memory for leaving protocol stack for only has 28K, the requirement of protocol stack certainly cannot be met, to solve this problem,
Common are following two method: a kind of method is to use off-gauge interface such as call-back manner；Another is memory pool
Technology, two kinds of processing techniques respectively have feature, but also have respective drawback under given conditions.
1) callbacks
Using call-back manner, device drives receive after message directly analytic message and call user time by protocol stack
It adjusts, reduces the space of protocol stack bedding storage message.This mode execution efficiency is higher, and EMS memory occupation is few.But this method
Can not compatibility standard protocol stack interface, original business module based on standard protocol stack interface can not use directly, can be safeguarded
Property and scalability are poor, and system stability is a greater impact.
2) universal memory pool technology
Memory pool is opened up according to business demand in system initialization, it is ensured that meet demand.Interface compatibility is good, Yuan Youji
In the transplanting extension that the code of standard interface can be convenient.But this method is needed in protocol stack initialization to each business mould
The EMS memory occupation of block carries out accurate statistics, and system development and business development coupling are strong, are unfavorable for hierarchical-development and business module
Development.
In above two mode, the call-back manner amount of will lead to business middleware module can not directly transplanting, it is maintainable poor；
Internal memory pool managing mode is unfavorable for the flexible addition and deployment of business module.
Summary of the invention
The object of the present invention is to provide a kind of Embedded Protocol Stack EMS memory management process, to solve to use universal memory at present
Business module caused by pond is not easy the problem of extending.
The present invention provides a kind of Embedded Protocol Stack EMS memory management process to solve above-mentioned technical problem, the management method
The following steps are included:
1) protocol stack self EMS memory is created, when protocol stack initializes to guarantee that system can be run；
2) EMS memory occupation of itself is counted according to demand and creates correspondence memory when business module initializes, it will be in creation
It deposits address and size submits to protocol stack, the memory of business module injection, and unified progress memory management are received by protocol stack；
3) when there is business module using memory, protocol stack carries out the memory of injection according to memory needed for the business module
Distribution.
The present invention only provides master data global memory when protocol stack initializes, to guarantee that system can be run；By industry
Protocol stack associated internal memory needed for being engaged in is provided by business module itself, and each business module is real by oneself according to demand in initialization
In the memory injection protocol stack that border uses, it is uniformly managed scheduling by protocol stack, the standard of protocol stack interface can either be met
Change, completely compatible original standard Socket interface, and simplified memory to greatest extent, protocol stack committed memory itself 4K with
It is interior.The present invention can preferably resolve protocol stack memory scale and business on the basis of keeping protocol stack standard interface and need
It asks and is difficult to adaptation issues, convenient for the extension of business module.
Further, the mode of memory size needed for the present invention gives specific determining business module, acquired memory
Size meets the actual demand of business module itself, and the size of memory needed for business module itself is as protocol stack according to needed for business
Socket number and Message processing performance requirement are calculated.
Further, it to guarantee that some important business modules can be assigned to memory in time, is distributed to business module
It is allocated when memory according to the priority of business module, guarantees that the business module of high priority is preferentially assigned to memory and holds
Row.
Further, The present invention gives allocation table be managed memory by way of, improve the efficiency of management, should
Method further includes creating dynamic memory distribution table in protocol stack initialization, for the memory information of storage service module creation,
Memory requirements, memory number and memory use state including business module.
Further, The present invention gives allocation table be managed memory by way of, improve the efficiency of management, should
Method further includes creating dynamic memory distribution table in protocol stack initialization, for the memory information of storage service module creation,
Memory requirements, priority, memory number and memory use state including business module.
Further, to improve allocative efficiency, protocol stack is when carrying out Memory Allocation to business module, according to the dynamic
Memory Allocation table is allocated.
Further, the business crash issue that each business module memory cross-reference causes in order to prevent makes point of memory
With orderly progress is used, the memory management that the protocol stack carries out includes the distribution, latch and recycling of memory, when business module makes
When with memory, Memory Allocation is carried out to it, and carries out the latch of correspondence memory according to the applicable cases of business module, when business mould
Block recycles correspondence memory when not using memory.
Detailed description of the invention
Fig. 1 is protocol stack EMS memory management process flow chart of the invention；
Fig. 2 is the flow chart of protocol stack Memory Allocation of the invention；
Fig. 3 is the instance graph of protocol stack memory management of the invention.
Specific embodiment
A specific embodiment of the invention is described further with reference to the accompanying drawing.
The present invention only provides master data global memory when protocol stack initializes, and guarantee system can be run；Business institute
Protocol stack associated internal memory is needed by business module itself to provide -- it is according to demand that oneself is practical when each business module initializes
The memory injection protocol stack internal memory pool managing module used, carries out unified management scheduling by protocol stack.Its process as shown in Figure 1,
Specific implementation step is as follows.
1. protocol stack self EMS memory is created in protocol stack initialization, to guarantee that system can be run.
For embedded device, the memory that protocol stack itself occupies is all within 4K, therefore, initial in protocol stack
Need to create the memory of a 4K when change.Meanwhile the management to memory for convenience, it will also create one in protocol stack initialization
A dynamic memory distribution table, is used to store business module memory information.Dynamic memory distribution table includes memory requirements size, compiles
Number, priority, state；The degree of priority of preferential order reaction business procedure, can be managed program according to priority, guarantee high
The quick storage allocation of priority program energy simultaneously executes；Memory use state identifies the service condition of memory using reference count,
In order to which protocol stack management program is preferably deployed.Common dynamic Memory Allocation tableau format is as shown in table 2.
Table 2
| Memory requirements (K) | Number | Priority | State | |
| Business 1 | X | 1 | 1 | It has activated |
| Business 2 | Y | 2 | 2 | It has recycled |
| ……. | Z | 3 | 3 | It is not used |
| ……. | A | 4 | 3 | It is not used |
2. business module counts the EMS memory occupation of itself according to demand and creates correspondence memory when initializing, will be in creation
It deposits and is injected into protocol stack, be uniformly managed by protocol stack.
The socket interface of protocol stack compatibility standard, original software logic function can provide industry with directly transplanting, protocol stack
Business demand memory calculates interface, and access interface socket number and Message processing performance requirement according to needed for business calculates institute
Need memory size.Protocol stack provides business memory grouting socket, and the memory which injects business datum is according to business demand
Classify, is stored in different Installed System Memory ponds.For inject low memory return system mistake, the development phase by with
Family is adjusted.
When business module initializes, calculate in its needs and save as x, complete dynamic memory application IP addresses, and and protocol stack into
Row is linked up, and memory information is stored in dynamic memory distribution table, number n, memory are occupied in dynamic memory distribution table
For the information of x, as shown in table 2.The memory requirements of each business module is less than the dynamic memory address size of protocol stack management.
3. protocol stack carries out the memory of injection according to memory needed for the business module when there is business module using memory
Distribution.
Protocol stack uniformly carries out memory management scheduling, and protocol stack memory management includes the distribution and recycling of memory, and according to
Service application situation carries out the latch mechanism of correspondence memory, and sequence cross-reference is avoided to cause business collapse.The memory pipe of protocol stack
Reason further includes being managed according to business module priority, when the higher program of service priority (business module) applies for memory
When, memory applications are calculated, when free memory amount is not enough, shutdown signal is sent to the low priority program for occupying memory,
It exits low priority program and occupies memory, to be supplied to high-priority service use, guarantee that high priority program can be quickly
Storage allocation simultaneously executes.The detailed process that memory uses is as shown in Fig. 2, specific step is as follows.
When business module is needed using memory, which sends memory request for utilization, and protocol stack receives
It after this application, counts and memory can be used, and judge to can be used whether memory meets the needs of business module；If satisfied, agreement
Stack activates correspondence memory according to dynamic memory distribution table, and juxtaposition activates position, which starts and use correspondence memory；When can
When being unsatisfactory for requiring using memory, the business module is controlled into memory queue to be used, judges that the business module is corresponding preferential
Whether grade is greater than the priority of business module corresponding to enabled memory, if more than enabled memory table is then retrieved, according to priority
It is exited from low progress program, and the memory that will move out is recycled, and the memory of recycling is increased in usable memory, is sentenced again
It is disconnected whether to meet memory requirement, carry out Memory Allocation.
When business datum injects memory, parameter is inputted in addition to memory address and size, further includes socket number, various types of
The business elements information such as the length of the message of type and corresponding number.Protocol stack is split memory address according to these information
And it is put into the memory pool of corresponding types, efficient access is carried out convenient for business.Such as 104 modules, it is (5 corresponding to need support 4 connections
Socket includes a monitoring socket), 20 short frame (256 byte) message, 4 long frame (1518 byte) message.Information
After injecting protocol stack, protocol stack successively opens up 5 socket, 20 short frames, 4 long frame memory pool from injection memory, successively
Complete the distribution of memory.
It is illustrated by taking the protocol stack memory of a certain specific communication equipment as an example below.As shown in figure 3, relevant business
Module includes 104 protocol modules, Web protocol module and Telnet protocol module etc., the memory management for each protocol module
It is carried out by protocol stack management module, wherein each protocol module is communicated with protocol stack management module, is pressed by protocol stack management module
The distribution and recycling of memory are carried out according to dynamic memory distribution table.
Embedded system free memory is 128K in this example, and leaving protocol stack committed memory for is 4K, can dominate interior save as
124K, dynamic memory distribution table are managed by protocol stack management module, dynamic memory application are completed when business module initializes, and more
New information dynamically distributes in table to memory, as shown in table 3.
Protocol stack initialization
Protocol stack is responsible for the distribution and recycling of memory, when initialization, establishes dynamic memory distribution table inside protocol stack.
IEC104 protocol initializing
When IEC104 protocol process module initializes, calculates in its needs and save as 4.2K, which injects protocol stack,
It is managed by protocol stack memory management module.
Web protocol initialization
When web protocol processing module initializes, calculates in its needs and save as 20K, which injects protocol stack, by assisting
View stack memory management module is managed.
Telnet command row protocol initializing
When telnet command row protocol process module initializes, calculates in its needs and save as 15K, module memory injection association
Stack is discussed, is managed by protocol stack memory management module.
103 protocol initializings
When 103 protocol process module initialize, calculates in its needs and save as 5K, which injects protocol stack, by assisting
View stack memory management module is managed.
The management distribution of memory is carried out according to the process of Fig. 2, detailed process is illustrated in front, no longer superfluous here
It states.
Table 3
| Memory size (K) | Number | Priority | |
| 104 agreements | 4.2K | 1 | 1 |
| Telnet command row agreement | 3.1K | 2 | 2 |
| Web service agreement | 20K | 3 | 3 |
| 103 agreements | 5K | 4 | 1 |
By the above process it is found that the present invention can satisfy the standardization of protocol stack interface, completely compatible original standard
Socket interface.Memory has been simplified to greatest extent again, and protocol stack committed memory itself is within 4K.Business associated internal memory occupies
All by business datum according to injection protocol stack memory management engine after itself actual demand extension.Protocol stack standardization is being kept to connect
Protocol stack memory scale is preferably resolved on the basis of mouthful and business demand is difficult to adaptation issues.
Claims (7)
1. a kind of Embedded Protocol Stack EMS memory management process, which is characterized in that the management method the following steps are included:
1) protocol stack self EMS memory is created, when protocol stack initializes to guarantee that system can be run；
2) EMS memory occupation of itself is counted according to demand and creates correspondence memory when business module initializes, by the memory of creation
Location and size submit to protocol stack, and the memory of business module injection, and unified progress memory management are received by protocol stack；
3) when there is business module using memory, protocol stack is divided the memory of injection according to memory needed for the business module
Match.
2. Embedded Protocol Stack EMS memory management process according to claim 1, which is characterized in that needed for business module itself
The size of memory is calculated as protocol stack socket number and Message processing performance requirement according to needed for business.
3. Embedded Protocol Stack EMS memory management process according to claim 1, which is characterized in that distributed to business module
It is allocated when memory according to the priority of business module, guarantees that the business module of high priority is preferentially assigned to memory and holds
Row.
4. Embedded Protocol Stack EMS memory management process according to claim 1, which is characterized in that this method further includes assisting
When discussing stack initialization, dynamic memory distribution table is created, for the memory information of storage service module creation, including business module
Memory requirements, memory number and memory use state.
5. Embedded Protocol Stack EMS memory management process according to claim 3, which is characterized in that this method further includes assisting
When discussing stack initialization, dynamic memory distribution table is created, for the memory information of storage service module creation, including business module
Memory requirements, priority, memory number and memory use state.
6. Embedded Protocol Stack EMS memory management process according to claim 4 or 5, which is characterized in that protocol stack is to industry
When module of being engaged in carries out Memory Allocation, it is allocated according to the dynamic memory distribution table.
7. Embedded Protocol Stack EMS memory management process according to claim 1, which is characterized in that the protocol stack carried out
Memory management includes the distribution, latch and recycling of memory, and when business module uses memory, Memory Allocation, and root are carried out to it
The latch that correspondence memory is carried out according to the applicable cases of business module returns correspondence memory when business module does not use memory
It receives.
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